Valve-grinding machine



W. F. BRANNING.

VALVE GRINDING MACHINE.

APPLICATION FILED NOV-6,1918.

Patented Dec. 7,1920.

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VALVE GRINDING MACHINE.

APPLICATION FILED NOV-6,1918,

Patented Dec. 7, 1920.

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aim? $2 M UNITED STATES I wiLL'rn r. BRANNING, or SAN ANTONIO, TEXAS.

VALVE-GRINDIN G MACHINE.

Specification of Letters Patent.

Patented Dec. 7 1920.

Application filed November 6, 1918. Serial No. 261,377.

To all whom it may concern Be it known that I, WILLIE F. BRANNING, a citizen of the United States, residing at San Antonio, in the county of Bexar and State of Texas, have invented new and useful Im provements in Valve-Grinding Machines, of which the following is a specification.

My present invention pertains to the regrinding of valve seats and the like; and it has for its general object to provide a slmple and efficient machine constructed and arranged to be expeditiously and easily secured in a valve casing and adap ed to be conveniently operated in such manner as to bring about the quick and thorough regrinding)of a valve seat or the like. p ther objects and practical advantages of the invention will be fully understood from the following description and claims when the same are read in connection with the drawings accompanying and forming part of this specification, in which: 1 t

Figure 1 is a side elevation of the machine constituting the best practical embodiment of my invention of which I am aware. I

Fig. 2 is a plan view of the same.

F ig.- 3 is a vertical diametrical sectlon of the machine.

Fig. 4 is a horizontal section taken in the plane indicated by the line 4-4 of Flg. 3.

Fig. 5 is a detail diametrical section of a type of grinding stone that may be substituted for the type shown in Figs. 1 and 3.

Fig. 6 is a transverse Section taken in the 1 plane indicated by the line 6-6 of Fig. 3, looking upwardly.

Referring by numerals to the said drawings and more particularly to Figs. l'to' 4 thereof 1 is the vertical central shaft of my novel machine. The said shaft is exteriorly threaded at its lower end as indicated by 2 and is provided in said end with a threaded bore 3. The said bore 3 is for the engagement of the threaded shank of a bevel head screw 4, and the thread 2 is for the engagement of Babbitt metal bushed in a grinding disk 5 of carborundum or other suitable material. When conditions require a grinding disk 5 of the shape shown in Fig. 5 may be substituted for the element 5. I would also have itv understood that in order to contribute strength to the fixture of the disk 5 on the shaft 1, a metallic washer 6 is preferably'interposed between the head of the screw and the underside of the disk 5, as clearly shown in Fig. 3.

Surrounding the shaft 1 in such manner as to permit upward and downward movement of the shaft without undue friction is a handle 12; the said handle being prefer-- ably connected to the shaft through the medium of a set screw 13.

'At 14 is a nut mounted on and engaged with the threaded portion 8 of the casmg 7 and surrounding the casing belowthe said nut 14 is a body 15 madeup of connected sections superimposed one upon the other.

- The lower section 16 of the said body '15 is provided with a central recess 16, and within the said recess is a circular series of pairs of'spaced hooks 17. Secured between the upper and lower sections of the body 15 1s a ournal 18, headed at its inner end as indicated by 19, whereby it is strongly secured between these sectlons, and havin in its outer end a threaded bore 20. his threaded bore receives a headed bolt 21 which serves to retain on the journal and against the body 15 a beveled gear 22 which is intermeshed with and designed to transmit rotary motion to the gear 11. The said gear 22 is provided at 23 with a handle through the medium of which it may be readily turned.

At 24 is a circular series of expansion standards. These standards 24 are grouped about the casing 7 and are of the shape in cross section shown in Figs. 4 and 6 so that their inner and outer sides describe parts of concentric circles. At their upper ends the standards 24 are provided with journals 25 which are disposed in and supported b the hooks 17 on the lower section of the b0 y 15. The lower ends of the standards 24 are beveled in conformity to the lower cone portion 9 of the casing 7, and pivotally connected to and depending from said lower ends are angular members 26, preferably of steel. The inner sides of the members 26 are beveled in conformity to the casing portion 9 while the vouter sides thereof are referably erpendicular as illustrated. lhere is su cient space between the hooks 17 and the threaded portion 8 of the casing 7 for the passage of the journals 25 on the standards 24, and consequently the said journals 25 may be readily placed in and removed from the hooks 17, and yet thereis no liability of the said journals being casually displaced incidental to the .use of-the machine. j v

In putting my machine into use the bonnet of a valve is removed, and the machine is taken in the right hand of the operator who clasps the standards 24 in his left hand and draws them close together against the easing 7. The operator then introduces the lower portion of the machine into the valve casing and resses the shaft l downwardly until the 'dlSk 5 contacts. with the valve seat. Then holding the machine in the left hand the operator feeds the nut 14 downwardly until the casing 7 has expanded the clamp members 26 in the valve casing to an extent suflicient to render said members tight in the casing. With this done the machine is operated by turning the gear 22. In this manner the shaft 1 and the disk 5 are rotated and the regrinding of the valve seat, accomplished. The handle 12 is preferably of suflicient weight to enable the machine to regrind small valve seats. When it is not, the set screw 13 is loosened to render said handle 12 free. Sufficient pressure may then be exerted by the hand of the operator; it being understood in this connection that the downward pressure is ap lied to the machine as a whole.

hen the machine is to be used in conjunction with large valves, clamp members 26, larger than those illustrated, may be substituted for the latter. I would also have it understood that a shell drill may be employed in the machine where a raised valve seat is desired.

At 38 is a nut having an interior thread similar to that of nut 14 to engage the threaded casing 7 Said nut 38 is exteriorly threaded at 30 for theengagement of an upper nut section 31. The nut 38 is recessed at 32 to receive a collar 34 which is fixed by a set screw 35 to shaft 1. A radial opening 33 is preferably provided in the nut 38 to afford convenient access to the screw 35. The collar 34 serves as a working bearing forthe complete nut, and it is preferably grooved at its upper side to receive antifriction balls 37 which are also retained in a oove in the underside of the section 31.

he operation of the machine will be better understood when it is stated that the gear a clearance of from one-sixteenth to oneeighth of an inch between the seating points of the teeth of gears 11 and 22. This fasten-.

ing will enable the operator to cut away the damaged portion of a valve seat but 1f it is insufficient the gear 11 may be released and raised one-eighth of an inch on shaft 1 and again fixed thereto. There should be sufficient clearance between the nuts 14 and 38 also having an exteriorly threaded upper portion, a body surrounding the threaded portion of the casing, expansion standards grouped about the casing and pivotall connected with the body and having pivoted clamping members opposed to the tapered portion of the casing, means on the casingfor forcing said body downwardly, a hand wheel mounted on the body at the side thereof and having gear teeth, a gear adjustably fixed on the shaft and intermeshed with the gear teeth of the hand wheel, and a handle superimposed upon and detachably connected to the upper end of the shaft.

2. In a valve seat regrinding machine, the combination of a central shaft, grinding means carried at the lower end thereof, a casing on said shaft and having a lower enlarged and upwardly tapered portion and also having an exteriorly threaded upper portion, a body surrounding the threaded casing portion and including an upper section and a lower section connected to the upper section and having a central opening and a circular series of pairs of hooks disposed in said opening and spaced from the casing, expansion standards grouped about the casing and having journals bearing in said hooks, clamping members pivoted to the lower portions of the expansion standards and opposed to the tapered lower portion of the casing, a headed journal secured between the sections of the body, a combined hand and gear wheel mounted on said journals, a screw bearing in the journal and securing the said wheel thereon, means on the casing for forcing the body downwardly, and a gear wheel adjustably fixed on the shaft and intermeshed with the combined hand and gear wheel.

3. In a valve seat regrinding machine, the combination of a central shaft, grinding means carried at the lower end thereof, a casing on said shaft and having a lower enlarged and upwardly tapered portion and also having an exteriorly threaded upper portion, a body surrounding the threaded portion of the casing, expansion standards grouped about the casing and pivotally connected with the body and having pivoted clamping members opposed to the tapered portion of the casing, means on the casing for forcing said body downwardly, and cooperating means on the body and shaft to rotate the latter about its axis.

4. The combination of a central shaft, a gear fixed thereto, a loose casing on the shaft and having a lower enlarged and upwardly tapered portion and an upper threaded portion, grinding means at the lower end of the shaft, a body surrounding and slidable upon the casing, means on the casing for forcing the body downwardly, a drive gear mounted on the body and intermeshed with the gear on the shaft, and expansible means connected with and depending from the body and opposed to the lower tapered portion of the casing and adapted to fix the device in a valve casing.

5. The combination of a central shaft, grinding means at the lower end thereof, a casing loose on the shaft and having a threaded portion, a collar adjustably fixed to the shaft, nuts threaded on the casing below the collar, a nut section connected to the upper of the said nuts and bearing on the collar, a body slidable on the casing and movable by the lower of the said nuts, expansible means connected to the body and operable by endwise movement of the casing to fix the device in a valve casing, and means to rotate the shaft about its axis.

6. The combination of a shaft, a casing loose about the shaft and inwardly tapered at one end and exteriorly threaded at its op posite end, grinding means at one end of the shaft, a body slidable on the casing, an adjustmentnut on the casing above the body, a collar fixed to the shaft above said adjustment nut, a nut receiving the collar and interposed between the same and the adjustment nut and threaded on the casing, a section connected to the second-named nut and arranged above and bearing on the collar, driving means on the body and connected with the shaft, and expansible means connected to the body andmovable outwardly by endwise movement of the casing to fix the device in a valve casing or the like.

. In testimony whereof I aflix my signature.

WILLIE F. BRANNING. 

